Viva Series, Survey - Hidden Points 1655
56.2.5 Backwards Bearing & Distance
Description In order to compute the hidden point, the measurements are taken from the hidden point.
One point must be known. It
• can already exist in the job.
• can be manually measured during the hidden point measurements.
• can be manually typed in.
The distance and the bearing from the hidden point to the known point are to be deter-
mined. An auxiliary point helps compute the bearing which might not be known. An auxiliary
point can be measured in the direction from the hidden point to the known point.
Diagram
Known
P0 Known point
To be measured
α Bearing from P2 to P0
d Distance from P2 to P0
P1 Auxiliary point, optional
Unknown
P2 Hidden point
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